Yellow spots on seedlings

These spots just appeared today on 2 of my seedlings. The only thing I can think of that I've done differently recently is that I added Calimagic, at the recommend concentration, to yesterday evening's watering. Is this something that I should be concerned about?

Stone Age said:

These spots just appeared today on 2 of my seedlings. The only thing I can think of that I've done differently recently is that I added Calimagic, at the recommend concentration, to yesterday evening's watering. Is this something that I should be concerned about?

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Why are you giving anything? What’s the humidity and temperature? That looks awfully dry.

I don't have a thermometer/hygrometer in the tent. The temp in the room is 73. The humidity is low, probably around 20%.

The soil feels slightly moist a couple of inches down, but I do think it's due for a watering.

It’s young yet
Cover with soda bottle half. Until 6 tall. Then re evaluate
Soil?
warm and humid. Think lush

OkSureWhyNot said:

It’s young yet
Cover with soda bottle half. Until 6 tall. Then re evaluate
Soil?
warm and humid. Think lush

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Thanks. Soil is 50/50 FFHF and FFOF, with perlite and Mykos..

Yeah I realize that humidity isn't ideal, but it's dry here, especially during the winter. I hadn't thought about covering with clear plastic.

Quick update: It hasn't gotten much worse since yesterday. I still don't know what it is; after a bit more research, it looks like the type of damage caused by thrips, but I examined the plants closely and didn't see any. I guess I won't worry about it if it doesn't get worse.